Mohr s Circle

The transformation equations for plane stress can be represented in graphical form by a plot known as Mohr’s Circle.
•This graphical representation is extremely useful because it enables you to visualize the relationships between the normal and shear stresses acting on various inclined planes at a point in a stressed body.•Using Mohr’s Circle you can also calculate principal stresses, maximum shear stresses and stresses on inclined planes.The general three-dimensional state of stress consists of three unequal principal stresses acting at a point. This is called a triaxial state of stress.
If two of the three principal stresses are equal, the state of stress is known as cylindrical, while if all three principal stresses are equal, the state of stress is said to be hydrostatic, or spherical. The determination of the principal stresses for a three-dimensional state of stress in terms of the stresses acting on an arbitrary cartesiancoordinate system is an extension of the method described.